throw a (monkey) wrench in the works

US /θroʊ ə ˈmʌŋ.ki rɛntʃ ɪn ðə wɜrks/
UK /θroʊ ə ˈmʌŋ.ki rɛntʃ ɪn ðə wɜrks/
"throw a (monkey) wrench in the works" picture
1.

찬물을 끼얹다, 계획을 망치다

to cause a problem or difficulty that prevents something from happening or succeeding

:
The sudden resignation of the CEO really threw a monkey wrench in the works for our merger plans.
CEO의 갑작스러운 사임은 합병 계획에 정말 찬물을 끼얹었다.
We had everything planned, but the bad weather threw a wrench in the works.
모든 것을 계획했지만, 나쁜 날씨가 계획을 망쳤다.